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#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm_types.h>
#include <linux/mmzone.h>
#include <asm/pgtable.h>
#include <stdio.h>
#include <linux/page-flags.h>

asmlinkage int sys_zone_stats(void){
        struct zone *actualmemory;
        struct page *actualpage;
        struct list_head actualLru;
        int i,active, inactive,referencedA, referencedI;
        active=inactive=referencedA=referencedI=0;
        for_each_zone(actualmemory){
          for_each_lru(i) {
            actualLru = actualmemory->zone_pgdat->lruvec.lists[i];
            list_for_each_entry(actualpage, &actualLru.list, lru) {
              if(i == LRU_ACTIVE_ANON || i == LRU_ACTIVE_FILE){
                active++;
                if(PageReferenced(actualpage)){
                        referencedA ++;
                }
              }else{
                inactive++;
                if(PageReferenced(actualpage)){
                        referencedI++;
                }
              }
            }
          }
        }
        printk("Pages activos: %d \n", active);
        printk("Pages inactivos: %d \n", inactive);
        printk("Pages activos con bit de referencia: %d \n", referencedA);
        printk("Pages inactivos con bit de referencia: %d \n", referencedI);
        return 0;
}